Has anyone had any experience in using a wideband oxygen sensors on the MKIII?

hey guys.
i am currently in the process of looking into getting a f21t turbo fitted to my 2002 mk4 gti 1.8t agu and have been chatting to doug at frankenturbo about tuning options. he has led me to believe that tuning of a narrow band agu ecu was rather limiting and that my best bet was to upgrade...